[Solution] (a) Starting with the geometric series ∑_n=0^∞ x^n, find the sum of the series ∑_n=1^∞ n x^n-1 |x|<1 (b) Find the sum of


Question: (a) Starting with the geometric series \(\sum_{n=0}^{\infty} x^{n}\), find the sum of the series

\[\sum_{n=1}^{\infty} n x^{n-1} \quad|x|<1\]

(b) Find the sum of each of the following series.

  1. \(\sum_{n=1}^{\infty} n x^{n}, \quad|x|<1\)
  2. \(\sum_{n=1}^{\infty} \frac{n}{2^{n}}\)

(c) Find the sum of each of the following series.

  1. \(\sum_{n=2}^{\infty} n(n-1) x^{n},|x|<1\)
  2. \(\sum_{n=2}^{\infty} \frac{n^{2}-n}{2^{n}}\)
  3. \(\sum_{n=1}^{\infty} \frac{n^{2}}{2^{n}}\)

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